Everleagues - Everleagues is a cloud-based application that offers team communication, file sharing and storage, data tracking, and activities management.

Prosody - Prosody is a modern flexible communications server for Jabber/XMPP written in Lua.

Stork.ai - AI-Based Collaboration for Hybrid Teams. Rich media messaging, advanced video and voice conferencing, auto-transcribing and screen sharing. Serendipitous meetings at the water-cooler with your human and AI teammates.

Openfire - Openfire (formerly Wildfire) is a cross-platform instant messaging (IM) and groupchat server.

openmeet - Account free video conferencing with a rooms component that lets you use VC within a physical meeting room. The server can also be hosted in your own cloud for extra privacy/security.

ejabberd SaaS - Realtime XMPP and MQTT Software and Infrastructure as a Service.